Islamabad: A small-sized mysterious drone-like aircraft has reportedly been spotted hovering over the central jail building in Karachi.

According to sources, a droning sound drew authorities`` and local residents`` attention.

Drawing a blank, the Civil Aviation Authority’s (CAA) air traffic control tower denied giving permission to any such flight; the News quoted the sources, as saying.

According to the paper, the authorities were trying to find out the answers to the questions like what that plane-like unidentified flying object really was, whether it was manned or unmanned and why it was hovering over just the central jail building.